1. Clinic of Preventive Dentistry; Periodontology and Cariology; Center for Dental Medicine; University of Zürich; Zürich Switzerland
2. Division of Oral Microbiology and Immunology; Institute of Oral Biology; Center for Dental Medicine; University of Zürich; Zürich Switzerland
3. Division of Cariology and Endodontics; Department of Dental Medicine; Karolinska Institute; Huddinge Sweden